The problem with Ebay is that you might not get much for them as people are scepticle with regards to their providence.
You would possibly be better off with a specialist designer resale site such as Hardly Ever Worn It
http://www.hardlyeverwornit.com which apparently is used by those in the industry.
They take a much larger cut than Ebay but theoretically they get a much higher price as they guarantee the item is genuine.